MOOG D634-319C Product Description

MOOG D634-319C is a direct-drive single-stage DDV servo valve from the D634 series, equipped with integrated closed-loop spool position electronics and analog control interface. Powered by a permanent magnet linear force motor, this valve controls hydraulic flow precisely without pilot oil supply. It converts electrical command signals into proportional hydraulic output for high-precision position, velocity, force and pressure control, delivering fast dynamic response and low hysteresis for critical hydraulic motion systems.

Product Features

• Single-stage direct drive design, no pilot oil required, simplifying hydraulic circuit layout
• Integrated closed-loop spool position feedback for high repeatability and minimal hysteresis
• Spring-centered fail-safe spool; returns to neutral upon power loss to stop actuator movement
• ISO 4401 size 05 mounting pattern for standard manifold installation
• Max working pressure up to 350 bar (5000 psi) for heavy-duty hydraulic systems
• Pressure-independent dynamic response, stable performance under varying load conditions
• Built-in 24VDC onboard electronics accepting analog command signals
• Compact and rugged construction, good resistance to vibration and shock in industrial sites
• Low null current consumption for improved energy efficiency during steady state operation

Application Scenarios

• Material testing machines, fatigue test rigs and static/dynamic force test benches
• Metal forming equipment, injection molding and die-casting machine motion control
• Steel mill rolling mills, continuous casting and heavy press hydraulic control systems
• Aerospace component test benches and simulator hydraulic actuation
• Offshore and marine heavy hydraulic positioning systems
• Power plant turbine control and high-precision hydraulic actuator retrofits
• Replacement spare for existing D634 series servo valve maintenance and overhaul

FAQ